DSDP_H and DSDP_T properties

Stephen Waite · July 17, 2014, 00:37

Hello, I'm simulating flow with a variable composition mixture with three components (air ideal gas, CO2 at STP and H2O) however when I go to run the simulation I get the following errors:

"The property DSDP_T is only present in some of the components of the mixture GasMixture"

"The property DSDP_H is only present in some of the components of the mixture GasMixture"

where GasMixture is the name of the variable composition mixture.

I'm unsure about how to change/set these DSDP_T and DSDP_H properties seeing all components of the gas mixture are defined in the CFX materials library.

Thanks in advance for your help.

ghorrocks · July 17, 2014, 06:02

I suspect (but am not sure) that it is looking for ideal gas properties for the CO2 and H2O components. As CO2 and H2O are constant density fluids I would generate a constant density air component at the appropriate condition so all your components are constant density.

July 17, 2014, 00:37	DSDP_H and DSDP_T properties	#1
Stephen Waite New Member Stephen Waite Join Date: May 2013 Location: Auckland, New Zealand Posts: 29 Rep Power: 12	Hello, I'm simulating flow with a variable composition mixture with three components (air ideal gas, CO2 at STP and H2O) however when I go to run the simulation I get the following errors: "The property DSDP_T is only present in some of the components of the mixture GasMixture" "The property DSDP_H is only present in some of the components of the mixture GasMixture" where GasMixture is the name of the variable composition mixture. I'm unsure about how to change/set these DSDP_T and DSDP_H properties seeing all components of the gas mixture are defined in the CFX materials library. Thanks in advance for your help.

July 17, 2014, 06:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I suspect (but am not sure) that it is looking for ideal gas properties for the CO2 and H2O components. As CO2 and H2O are constant density fluids I would generate a constant density air component at the appropriate condition so all your components are constant density.